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Synapse 0.33.1 (2018-08-02)

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===========================
 
 SECURITY FIXES
 --------------
 
 - Fix a potential issue where servers could request events for rooms they have not joined. (`#3641 <https://github.com/matrix-org/synapse/issues/3641>`_)
 - Fix a potential issue where users could see events in private rooms before they joined. (`#3642 <https://github.com/matrix-org/synapse/issues/3642>`_)
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Merge tag 'v0.33.1'

Synapse 0.33.1 (2018-08-02)
===========================

SECURITY FIXES
--------------

- Fix a potential issue where servers could request events for rooms they have not joined. (`#3641 <https://github.com/matrix-org/synapse/issues/3641>`_)
- Fix a potential issue where users could see events in private rooms before they joined. (`#3642 <https://github.com/matrix-org/synapse/issues/3642>`_)
This commit is contained in:
Richard van der Hoff 2018-08-02 15:40:44 +01:00
commit 43ecfe0b10
9 changed files with 73 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
CHANGES.rst
View file

@ -1,3 +1,13 @@
Synapse 0.33.1 (2018-08-02)
===========================
SECURITY FIXES
--------------
- Fix a potential issue where servers could request events for rooms they have not joined. (`#3641 <https://github.com/matrix-org/synapse/issues/3641>`_)
- Fix a potential issue where users could see events in private rooms before they joined. (`#3642 <https://github.com/matrix-org/synapse/issues/3642>`_)
Synapse 0.33.0 (2018-07-19)
===========================

2
synapse/__init__.py
View file

@ -17,4 +17,4 @@
""" This is a reference implementation of a Matrix home server.
"""
__version__ = "0.33.0"
__version__ = "0.33.1"

1
synapse/federation/federation_server.py
View file

@ -425,6 +425,7 @@ class FederationServer(FederationBase):
ret = yield self.handler.on_query_auth(
origin,
event_id,
room_id,
signed_auth,
content.get("rejects", []),
content.get("missing", []),

25
synapse/handlers/events.py
View file

@ -19,10 +19,12 @@ import random
from twisted.internet import defer
from synapse.api.constants import EventTypes, Membership
from synapse.api.errors import AuthError
from synapse.events import EventBase
from synapse.events.utils import serialize_event
from synapse.types import UserID
from synapse.util.logutils import log_function
from synapse.visibility import filter_events_for_client
from ._base import BaseHandler
@ -129,11 +131,13 @@ class EventStreamHandler(BaseHandler):
class EventHandler(BaseHandler):
@defer.inlineCallbacks
def get_event(self, user, event_id):
def get_event(self, user, room_id, event_id):
"""Retrieve a single specified event.
Args:
user (synapse.types.UserID): The user requesting the event
room_id (str|None): The expected room id. We'll return None if the
event's room does not match.
event_id (str): The event ID to obtain.
Returns:
dict: An event, or None if there is no event matching this ID.
@ -142,13 +146,26 @@ class EventHandler(BaseHandler):
AuthError if the user does not have the rights to inspect this
event.
"""
event = yield self.store.get_event(event_id)
event = yield self.store.get_event(event_id, check_room_id=room_id)
if not event:
defer.returnValue(None)
return
if hasattr(event, "room_id"):
yield self.auth.check_joined_room(event.room_id, user.to_string())
users = yield self.store.get_users_in_room(event.room_id)
is_peeking = user.to_string() not in users
filtered = yield filter_events_for_client(
self.store,
user.to_string(),
[event],
is_peeking=is_peeking
)
if not filtered:
raise AuthError(
403,
"You don't have permission to access that event."
)
defer.returnValue(event)

29
synapse/handlers/federation.py
View file

@ -1349,6 +1349,11 @@ class FederationHandler(BaseHandler):
def get_state_for_pdu(self, room_id, event_id):
"""Returns the state at the event. i.e. not including said event.
"""
event = yield self.store.get_event(
event_id, allow_none=False, check_room_id=room_id,
)
state_groups = yield self.store.get_state_groups(
room_id, [event_id]
)
@ -1359,8 +1364,7 @@ class FederationHandler(BaseHandler):
(e.type, e.state_key): e for e in state
}
event = yield self.store.get_event(event_id)
if event and event.is_state():
if event.is_state():
# Get previous state
if "replaces_state" in event.unsigned:
prev_id = event.unsigned["replaces_state"]
@ -1391,6 +1395,10 @@ class FederationHandler(BaseHandler):
def get_state_ids_for_pdu(self, room_id, event_id):
"""Returns the state at the event. i.e. not including said event.
"""
event = yield self.store.get_event(
event_id, allow_none=False, check_room_id=room_id,
)
state_groups = yield self.store.get_state_groups_ids(
room_id, [event_id]
)
@ -1399,8 +1407,7 @@ class FederationHandler(BaseHandler):
_, state = state_groups.items().pop()
results = state
event = yield self.store.get_event(event_id)
if event and event.is_state():
if event.is_state():
# Get previous state
if "replaces_state" in event.unsigned:
prev_id = event.unsigned["replaces_state"]
@ -1706,8 +1713,19 @@ class FederationHandler(BaseHandler):
defer.returnValue(context)
@defer.inlineCallbacks
def on_query_auth(self, origin, event_id, remote_auth_chain, rejects,
def on_query_auth(self, origin, event_id, room_id, remote_auth_chain, rejects,
missing):
in_room = yield self.auth.check_host_in_room(
room_id,
origin
)
if not in_room:
raise AuthError(403, "Host not in room.")
event = yield self.store.get_event(
event_id, allow_none=False, check_room_id=room_id
)
# Just go through and process each event in `remote_auth_chain`. We
# don't want to fall into the trap of `missing` being wrong.
for e in remote_auth_chain:
@ -1717,7 +1735,6 @@ class FederationHandler(BaseHandler):
pass
# Now get the current auth_chain for the event.
event = yield self.store.get_event(event_id)
local_auth_chain = yield self.store.get_auth_chain(
[auth_id for auth_id, _ in event.auth_events],
include_given=True

2
synapse/rest/client/v1/events.py
View file

@ -88,7 +88,7 @@ class EventRestServlet(ClientV1RestServlet):
@defer.inlineCallbacks
def on_GET(self, request, event_id):
requester = yield self.auth.get_user_by_req(request)
event = yield self.event_handler.get_event(requester.user, event_id)
event = yield self.event_handler.get_event(requester.user, None, event_id)
time_now = self.clock.time_msec()
if event:

2
synapse/rest/client/v1/room.py
View file

@ -508,7 +508,7 @@ class RoomEventServlet(ClientV1RestServlet):
@defer.inlineCallbacks
def on_GET(self, request, room_id, event_id):
requester = yield self.auth.get_user_by_req(request)
event = yield self.event_handler.get_event(requester.user, event_id)
event = yield self.event_handler.get_event(requester.user, room_id, event_id)
time_now = self.clock.time_msec()
if event:

1
synapse/storage/event_federation.py
View file

@ -343,6 +343,7 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore,
table="events",
keyvalues={
"event_id": event_id,
"room_id": room_id,
},
retcol="depth",
allow_none=True,

20
synapse/storage/events_worker.py
View file

@ -19,7 +19,7 @@ from canonicaljson import json
from twisted.internet import defer
from synapse.api.errors import SynapseError
from synapse.api.errors import NotFoundError
# these are only included to make the type annotations work
from synapse.events import EventBase # noqa: F401
from synapse.events import FrozenEvent
@ -76,7 +76,7 @@ class EventsWorkerStore(SQLBaseStore):
@defer.inlineCallbacks
def get_event(self, event_id, check_redacted=True,
get_prev_content=False, allow_rejected=False,
allow_none=False):
allow_none=False, check_room_id=None):
"""Get an event from the database by event_id.
Args:
@ -87,7 +87,9 @@ class EventsWorkerStore(SQLBaseStore):
include the previous states content in the unsigned field.
allow_rejected (bool): If True return rejected events.
allow_none (bool): If True, return None if no event found, if
False throw an exception.
False throw a NotFoundError
check_room_id (str|None): if not None, check the room of the found event.
If there is a mismatch, behave as per allow_none.
Returns:
Deferred : A FrozenEvent.
@ -99,10 +101,16 @@ class EventsWorkerStore(SQLBaseStore):
allow_rejected=allow_rejected,
)
if not events and not allow_none:
raise SynapseError(404, "Could not find event %s" % (event_id,))
event = events[0] if events else None
defer.returnValue(events[0] if events else None)
if event is not None and check_room_id is not None:
if event.room_id != check_room_id:
event = None
if event is None and not allow_none:
raise NotFoundError("Could not find event %s" % (event_id,))
defer.returnValue(event)
@defer.inlineCallbacks
def get_events(self, event_ids, check_redacted=True,